There are a number of video tutorials at Discovery of Sound in the Sea (dosits.org) that may be helpful, including: 
- [Science of Sound][1]
- [Fundamentals of Underwater Sound][2]
- [Sound Movement & Sound Measurement][3]
- [Passive Acoustic Monitoring Overview: Applications for Marine Mammals & Fishes][4]

While these resources are focused on the marine environment, many of the fundamental ideas are the same for terrestrial/airborne acoustics (but not necessarily the equations, units of measurement or other details). Beginners might be best served to first learn about sound in their study environment and then learn about other environments (to minimize confusion in beginning).


  [1]: https://dosits.org/resources/resource-categories/dosits-videos/#tab-d1dbe147fa1c76d6197
  [2]: https://dosits.org/decision-makers/webinar-series/2020-webinar-series/fundamentals/
  [3]: https://dosits.org/decision-makers/webinar-series/webinar-archive-2015-16/webinar-archive-science-of-sound/
  [4]: https://dosits.org/decision-makers/webinar-series/2021-webinar-series/webinar-passive-acoustic/